I donno about that, he definitely tends toward conservative on occasion. Understandable given his constituents.

Notably, he's pro defense spending, pro some entitlements, completely anti-abortion (conception is the beginning of life whereas libertarianism dictates no governmental interference), anti-gay marriage but pro gay union equivalence (LP platform is no marriage at all recognised by government), and he supports political finance reform and regulation (lp platform dictates no intervention in private spending).

I'm a libertarian through and through, I'd vote for him in an instant if he ran, but I wouldn't pretend he's a libertarian, just heaps better than anything we've had for a very long time.